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噪声就是不需要的声音。噪声一般包括工业噪声和交通噪声。城市噪声的70%来源于交通噪声。交通噪声主要来自汽车噪声。本文围绕交通噪声的主要噪声源——汽车噪声作若干评述。
Noise is unwanted sound. Noise generally includes industrial noise and traffic noise. 70% of urban noise comes from traffic noise. Traffic noise mainly comes from car noise. This article focuses on the main noise source of traffic noise - car noise for some comments.